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' 29 September 2005
<br /> AGE-NC Project No 95-0167
<br />' Page 4 of 8 F
<br /> Paramount, California, and analyzed for the following constituents
<br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d,
<br /> respectively) in accordance with EPA Method 8015 Modified, and
<br /> • Benzene, toluene, ethylbenzene, and total xylenes (BTEX) and the fuel additives methyl
<br /> tertiary-butyl ether (MTBE), dl-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE),
<br /> tertiary-amyl methyl ether(TAME),tertiary-butyl alcohol(TBA), 1,2-dibromoethane(EDB)
<br /> and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B
<br /> All rinseate generated during drilling activities was containerized in properly labeled,DOT-approved
<br /> 55-gallon drums and stored on-site in an area lacking public access Twinned soil borings were
<br />' backfilled over their entire depths with a portland cement grout mix
<br />' 3.0. FINDINGS
<br /> Soil descriptions from the computer-generated CPT lithologic logs were integrated with previous
<br /> subsurface soil descriptions to construct the subsurface geologic model, cross sections A-A', B-B',
<br /> C-C', and D-D' were constructed to depict the general lithology beneath the site (Figures 3
<br /> through 6, respectively) The hydrocarbon impact to ground water and soil was quantified by
<br />' laboratory analysis of the ground water and soil samples
<br />' 31 STRATIGRAPHY
<br />' Generally, silt, clay, clayey silt, silty clay, sandy silt, silty sand, and sand were encountered from
<br /> 5 feet bsg to approximately 100 feet bsg,one soil sample,collected at 60 ft bsg in boring CPT-7,was
<br /> described as a greenish-brown coarse sand A distinctive interval consisting primarily of sand, silty
<br />' sand, sandy silt, and gravelly sand, as well as some silty clay, clayey silt, and silt, was identified at
<br /> depths between approximately 100 feet and 140 feet bsg From 140 feet bsg to the total depths of the
<br /> bonngs clayey silt,silty clay, silt,cemented sand,sand,silty sand, sandy silt,and gravelly sand were
<br />' identified, one soil sample, collected at 155 feet in CPT-8, was described as a dark gray sandy silt
<br />' 3 2 HYDROGEOLOGIC MODEL
<br /> A hydrogeologic, or hydrostratigraphic, unit(HU) is defined as a body of rock or sediment that has
<br />' hydrogeologic characteristics (i e hydraulic conductivity,pore pressure, etc ) that make it distinct
<br /> from surrounding bodies of rock or sediment(Sanders, 1998),or a part of a body of rock that forms
<br />' Advanced GeoEnvironmental,Inc
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